Online social network Facebook has been valued at $6.5 billion for a transaction that will see Russia’s Digital Sky Technologies purchase some $100 million worth of employees’ shares in the company for $14.77 per share. The deal will boost Digital Sky’s stake in Facebook to as much as 3.5%. When Digital Sky initially purchased Facebook shares back in May, the company was valued at $10 billion. In 2007, when Microsoft invested $240 million for a 1.6% stake in Facebook, the company was valued at $15 billion. Since that time, the company has added more than 100 million users and now counts over 200 million active users.